Microenvironmcntal Influences in Cytodifferentiation 227 



5 





6 



PLATE II. Metanephros of the 11-day mouse embryo cultured for 8 days on a 

 millipore filter platform. Note .glomeruli and epithelial tubules. FIG. 5. Fixed and 

 stained whole mount. FIG. 6. Fixed and stained section. 



